Digital television signal, digital television receiver, and method of processing digital television signal

A digital television (DTV) transmitter for processing a DTV signal in a DTV transmitter, the DTV transmitter comprising:

• a program and system information protocol (PSIP) generator to generate a plurality of extended text table (ETT) instances that appear in transport stream packets with common PID values, the ETT instances having common table ID values, each ETT instance comprising a section header and a message body, the section header containing a table identification (ID) extension field that serves to establish uniqueness of each ETT instance, the message body containing an extended text message (ETM) which provides detailed descriptions of a virtual channel or an event associated with each ETT instance, wherein the section header further contains a current next indicator field and a last section number field indicating a last section number;
• a multiplexer to multiplex the ETT instances and audio and video (AV) data;
• and
• a transmitter to transmit a DTV signal including the multiplexed ETT instances and AV data.